Collaborative Research: Understanding and Manipulating Magnetism and Spin Dynamics in Intercalated van der Waals Magnets

合作研究：理解和操纵插层范德华磁体中的磁性和自旋动力学

• 批准号: 2327827
• 负责人: Hanyu Zhu
• 金额: $ 25.8万
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-01-01 至 2026-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2327827&HistoricalAwards=false
• 关键词: Collaborative; Research; Understanding; Manipulating; Magnetism

Non-technical Abstract: Magnets play an essential role in modern technologies such as information storage, energy harvesting, high-speed transportation, water purification, and biomedicine. Commercial devices typically utilize three-dimensional magnets, in the form of bulk crystals or nanostructures, to realize the desired applications. This project focuses on atomically thin layers of two-dimensional magnetic materials, which have remarkable advantages over conventional three-dimensional magnets because of their exotic low-dimensional properties and high sensitivity to external stimuli. The goal of the project is to understand and manipulate the magnetic properties of a novel class of two-dimensional magnets through a highly integrated collaborative effort of two principal investigators with complementary expertise. The fundamental understanding and dynamic control of two-dimensional magnetism is anticipated to pave the way towards the realization of novel ultra-compact devices for modern information technology and beyond. Through the research project, the principal investigators will further their ongoing effort of training students, especially underrepresented minorities, to enhance diversity in STEM research. Meanwhile, interactive outreach activities are planned to promote STEM education in disadvantaged rural or suburban schools and to attract high school students to quantum materials research.Technical Abstract: Two-dimensional magnets offer a unique platform for both the fundamental study of exotic magnetism and the innovation of ultra-compact devices for advanced technologies. The overarching goal of this collaborative research project is to accurately map the magnetic phase diagram and manipulate spin dynamics in a family of self-intercalated van der Waals magnets, chromium tellurides. The experimental activities include: 1) establish precisely controlled intercalation-magnetism relations and create a phase diagram; 2) tuning and determining the relative influence of charge carriers, magnetic moments of intercalants, and atomic lattice spacing on the magnetic properties; 3) probing and manipulating the magnetization and coherent spin dynamics with ultrafast demagnetization, ferromagnetic resonance, and terahertz phonon excitation. The project will create systematic and comprehensive knowledge about magnetism and spin dynamics in this intriguing family of two-dimensional magnets. As such, the research project will offer a new scientific paradigm to understand and engineer two-dimensional intercalated magnetic materials. Correlated with the research components are interactive outreach programs that aim to foster STEM education in disadvantaged rural or suburban schools and inspire high school students by connecting them to quantum research.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：磁铁在现代技术中起着至关重要的作用，例如信息存储，能源收集，高速运输，水净化和生物医学。商业设备通常以散装晶体或纳米结构的形式使用三维磁铁来实现所需的应用。该项目的重点是二维磁性材料的原子薄层，由于其异国情调的低维特性和对外部刺激的高灵敏度，因此与常规三维磁体具有显着优势。该项目的目的是通过两位具有互补专业知识的主要研究人员的高度集成协作工作来了解和操纵新型二维磁铁类的磁性。预计对二维磁性的基本理解和动态控制将为实现新颖的现代信息技术及其他方面的新型超紧凑设备铺平道路。通过研究项目，首席研究人员将进一步培训学生，特别是代表性少数群体，以增强STEM研究的多样性。同时，计划进行互动式外展活动，以促进处境不利的农村或郊区学校中的STEM教育，并吸引高中生进行量子材料研究。技术摘要：二维磁铁为外来磁性主义和高级技术的超级冲洗设备的创新提供了一个独特的平台。该协作研究项目的总体目标是精确映射磁相图并操纵自我插入的范德华磁铁系列中的旋转动力学。实验活动包括：1）建立精确控制的插入 - 磁性关系并创建相图； 2）调整和确定电荷载体，插图剂的磁矩和原子晶格间距对磁性特性的相对影响； 3）用超快的磁化，铁磁共振和Terahertz Phonon激发探测和操纵磁化和相干自旋动力学。该项目将在这个有趣的二维磁铁家族中创造有关磁性和旋转动态的系统性全面知识。因此，该研究项目将提供一个新的科学范式来理解和设计二维互级磁性材料。与研究组件相关的是互动外展计划，旨在促进在处境不利的农村或郊区学校中进行STEM教育，并通过将他们连接到量子研究来激发高中生。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力和更广泛影响的评估来通过评估来获得支持的人。